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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 8.125% Senior Notes due 2020 | Dec. 31, 2013 8.125% Senior Notes due 2020 | Sep. 27, 2014 4.75% Senior Notes due 2023 | Dec. 31, 2013 4.75% Senior Notes due 2023 | Sep. 27, 2014 5.375% Senior Notes due 2024
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  |  | $ 245,000,000 |  | $ 500,000,000 |  | $ 325,000,000
Long-term debt, stated coupon rate |  |  |  |  | 8.125% | 8.125% | 4.75% | 4.75% | 5.375%
Long-term debt, maturity date |  |  |  |  | Mar. 15, 2020 | Mar. 15, 2020 | Jan. 15, 2023 | Jan. 15, 2023 |
Long-term debt, maturity year |  |  |  |  |  |  |  |  | 2024
Selling, general and administrative expenses allocated from Lear | $ 30,700,000 | $ 31,700,000 | $ 90,500,000 | $ 93,300,000 |  |  |  |  |

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